A quick per country analysis. From the top 20:

7 FRA
5 NED
3 GBR
3 AUS
1 GER
1 ITA

I'm impressed by the AUS results: Placing 3 of 7 in the top 20 is quite a good result (42%). A better result than the 7 out of 27 FRA (25%) or the abysmal 5 out of 37 NED (13%).

And not a BEL in sight, considering it was on their home water and that there was 34 BEL teams, quite a disappointment.

I guess the farthest the race is from your home country, the better the sailors become. Except for the US obviously